That a woman was found killed in one of the expeditions of the Messenger of Allah ﷺ, so the Messenger of Allah ﷺ rebuked that, and he prohibited killing women and children. There are narrations on this topic from Buraidah and Rabah - and they say he was Riyah - bin Ar-Rabi', Al-Aswad bin Sari', Ibn 'Abbas, and As-Sa'b bin Jaththamah.  

أَخْبَرَهُ أَنَّ امْرَأَةً وُجِدَتْ فِي بَعْضِ مَغَازِي رَسُولِ اللَّهِ ﷺ مَقْتُولَةً فَأَنْكَرَ رَسُولُ اللَّهِ ﷺ ذَلِكَ وَنَهَى عَنْ قَتْلِ النِّسَاءِ وَالصِّبْيَانِ وَفِي الْبَابِ عَنْ بُرَيْدَةَ وَرَبَاحٍ وَيُقَالُ رِيَاحُ بْنُ الرَّبِيعِ وَالأَسْوَدِ بْنِ سَرِيعٍ وَابْنِ عَبَّاسٍ وَالصَّعْبِ بْنِ جَثَّامَةَ  

"I was informed by As-Sa'b bin Jaththamah who said: " I said: "O Messenger of Allah our horses trampled over women and children of the idolaters." He said: "They are from their fathers.'"  

قُلْتُ يَا رَسُولَ اللَّهِ إِنَّ خَيْلَنَا أَوْطَأَتْ مِنْ نِسَاءِ الْمُشْرِكِينَ وَأَوْلاَدِهِمْ قَالَ هُمْ مِنْ آبَائِهِمْ